The Polish government said it believes that Russian secret services are behind the bombing of a major railway line in the NATO country, in what Prime Minister Donald Tusk described as an “unprecedented act of sabotage".

An explosion hit the rail line from Polish capital Warsaw to Lublin on Sunday, a key route for bringing supplies to neighboring Ukraine, which is fighting off an ongoing Russian invasion with Western help.

NATO allies accuse Russia of waging hybrid warfare against them in the form of sabotage attacks, espionage, cyberattacks, and disinformation campaigns. Moscow denies this and accuses NATO of seeking war with Russia.

There is a growing risk of a catastrophic direct NATO-Russia clash amid the Ukraine war. Both sides, going through a period of rapid rearmament, are arme

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